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ImportError during installation on MacOS 10.11.6

I'm trying to install Sage 7.3 for MacOS 10.11.6, and I get the following error:

 RecursionError: maximum recursion depth exceeded during compilation
Traceback (most recent call last):
  File "/Applications/", line 7, in <module>
    import argparse
  File "/Applications/", line 85, in <module>
    import collections as _collections
  File "/Applications/", line 9, in <module>
    from operator import itemgetter as _itemgetter, eq as _eq
ImportError: dlopen(/Applications/, 2): Symbol not found: __PyUnicodeUCS4_AsDefaultEncodedString
  Referenced from: /Applications/
  Expected in: flat namespace
 in /Applications/

Any ideas how to resolve it? I've seen anaconda might cause some issues with installation, is it the case here?